For people worried about climate (including me) it's distressing to see the attack, because the two men agree on the fundamental point, that we need a vigorous global campaign to prevent an awful destabilization of the climate. It's a shame to see supporters of that idea falling out with each other when their key point is not yet a universally-held view.

But Romm has never liked nuclear power, and perhaps we should feel complimented that he acknowledges any productive role for the technology. He is praising us with faint damn.

Romm and others suffer from a “silver bullet syndrome.” They argue that nuclear plants take years to build, and that recently we've been adding them at a slow rate, so nuclear won't solve the problem; therefore it's time to move on to technologies that are growing faster, like solar panels and wind turbines, they argue.

There are two problems with the argument: it's wrong and it's counterproductive.

It's wrong because the scale is so different. Everybody feels warm and fuzzy about seeing a solar panel on a rooftop, but according to the Energy Department's most recent statistics, which run through the end of September 2015, nuclear power is roughly 29 times larger than solar in this country, at 606,709 million kwh for the first nine months of last year, vs. 20,982 for solar.

Nuclear is about 4.5 times bigger than wind, which generated 134,578 million kwh over the period (data from table 7.2a of the Monthly Energy Review.)

Solar and wind both have plenty of room to grow, but not unlimited room. Each tends to produce energy in a concentrated period (noon for solar and night for wind) and when they start flooding their markets, the price of energy will drop at those times, reducing the logic of building more. This is one reason that electric systems need a variety of generation types, to supply on the schedule that consumers need, which differs from the timetable of natural forces.

And while solar and especially wind are good at providing energy, they don’t provide consistent power – that is, the ability to do work when the work needs doing. That’s why a “net zero energy” building still needs something else to back it up.

We don't want a system that is all solar or all wind – or all nuclear, for that matter – any more than we want every vehicle on the road to be an 18-wheeler, or every calorie on our dinner plate to be from tofu.

And until all the fossil emissions have ceased, we'll need every zero-carbon source we can find. Arguing over precisely how much of the solution will come from nuclear vs. other sources is simply not sensible. Also, the designs in the lab today will help meet the mid-century goal on which scientists and policy-makers are now focused, but we will need to keep building zero-carbon sources for many decades beyond that, to meet growing global demand.

And Romm is correct that to take a big slice out of carbon emissions, especially as world demand for electricity rises, is going to require an unprecedented expansion of nuclear power. If we do it with wind and solar, or geothermal or wave energy or and any other carbon-free source that we can lay our hands on, those, too, will require heroic levels of increase. Any successful strategy that takes a big bite out of emissions is going to have to show unprecedented growth rates.

Romm is also correct that we aren't building a lot of new reactors in this country right now, despite concern about global warming. That's mostly because the price of natural gas, a competitor to uranium, has collapsed. Using natural gas to replace coal guarantees a modest reduction in carbon emissions. But it also guarantees that the reduction will be only modest, because per kilowatt-hour, burning natural gas emits roughly three times as much carbon dioxide as our 2050 goal allows. Wind and sun are heavily subsidized, with dollars (through wind's production tax credit and solar's investment tax credit) and through a non-dollar promotion called a renewable energy portfolio. Nuclear is a micro-carbon source, like wind and solar, but does not benefit from those state-imposed quotas.

Taming climate change, the central focus of Romm's and Hansen's work, is going to require a lot of hard work on a lot of different fronts. It would be foolish not to push hard on all of them.

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And all the high-tech things we love.
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To explore.
To discover.
To create advanced technologies.
This invisible force creates jobs out of thin air.
It adds billions to our economy.
It's on even when we're not.
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This invisible force takes us to the outer reaches of outer space.
And to the very depths of our oceans.
It brings us together. And it makes us better.
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